TITLE

Organic molecular films on gold versus conducting polymer: Influence of injection barrier height and morphology on current–voltage characteristics

AUTHOR(S)
Koch, N.; Elschner, A.; Schwartz, J.; Kahn, A.
PUB. DATE
April 2003
SOURCE
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2281
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The current-voltage characteristics I(V) of model organic devices are studied under ultra-high-vacuum conditions. Active materials are N,N'-bis-(1-naphthyl)-N,N'-diphenyll - 1,1-biphenyl1-4,4'- diamine (α-NPD) and pentacene, electrode materials are polycrystalline Au and the conductive polymer poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/ PSS). Despite a similar work function of electrode material surfaces (∼ 5 eV), hole injection from PEDOT/PSS is significantly more efficient than from Au, due to a smaller hole injection barrier. Hole injection characteristics from Au electrodes for devices made from α-NPD are independent of deposition sequence and substrate used. Pentacene devices exhibit serious asymmetries in that respect. These are caused by a strong dependence of morphology and preferred molecular orientation on the substrate for the crystalline material.
ACCESSION #
9428275

 

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